linux-kernel - Re: [PATCH] hw_random: core, sleep interruptible in read

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Date:	Fri, 27 Nov 2015 16:40:34 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	linux-kernel@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
	linux-crypto@...r.kernel.org
Subject: Re: [PATCH] hw_random: core, sleep interruptible in read

On 11/27/2015, 02:06 PM, Herbert Xu wrote:
> On Thu, Nov 26, 2015 at 08:56:29PM +0100, Jiri Slaby wrote:
>>
>> diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
>> index a064237ff362..f003df162e09 100644
>> --- a/drivers/char/hw_random/core.c
>> +++ b/drivers/char/hw_random/core.c
>> @@ -238,7 +238,10 @@ static ssize_t rng_dev_read(struct file *filp, char __user *buf,
>>  			goto out;
>>  		}
>>  
>> -		mutex_lock(&reading_mutex);
>> +		if (mutex_lock_interruptible(&reading_mutex)) {
>> +			err = -EINTR;
> 
> Shouldn't this be ERESTARTSYS?

Yes, it actually can, given the retval is returned only if no data were
read yet.

thanks,
-- 
js
suse labs
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